1. Glass fiber filter cotton: Glass fiber filter cotton is mainly made of glass fibers of various thicknesses and lengths through special processing technology. Glass fiber has the characteristics of stable performance, high temperature resistance, high efficiency, large capacity, and long service life. And in some special circumstances, only the wave line can be competent. It is widely used in primary filter, high temperature resistant filter and high efficiency filter of general ventilation system, in places and environments with high air filtration requirements. 2. Activated carbon filter cotton: The characteristic of activated carbon is to remove the odor in the air. Activated carbon filter cotton means that the synthetic fibers are treated with carbon impregnation and glue. Because the function of activated carbon is to remove odors, the filtration efficiency is not emphasized. in use. Generally, it must be used with independent primary and medium-efficiency filters. 3. Synthetic fiber filter cotton: It can completely replace non-woven fabrics and glass fiber covering a full range of filtration products, including primary efficiency filters, medium efficiency filters, and high-efficiency filters in general filtration environments. It is an emerging filter material and a future filter. The main development direction of the material. Compared with other filter materials of the same level, it has the advantages of low resistance, light weight, large capacity, environmental protection (can be incinerated), and moderate price. Using (polyester fiber) as the main raw material, abbreviation: PET, polyester fiber is made of polyethylene terephthalate, also known as synthetic fiber or polyester. Polyester has excellent wrinkle resistance, elasticity and dimensional stability, good electrical insulation properties, sunlight resistance, friction resistance, mildew and moth resistance, good chemical resistance, weak acid and weak alkali resistance. The industry name is: chemical fiber. Chemical fiber is divided into large chemical fiber and small chemical fiber. Large chemical fiber refers to polyester fiber produced by high-quality PET chips.